Remove Latin or special char

To remove Latin or special char sed -e 's/[Ā]/A/g;s/[àâā]/a/g;s/[ọõ]/o/g;s/[íìī]/i/g;s/[êệ]/e/g;s/[ḥ]/h/g;s/[Ḥ]/H/g;s/[şṣ]/s/g;s/[ū]/u/g;s/[ʿ]//g;s/[Ṣ]/S/g;s/[Ṭ]/T/g;s/[ṭ]/t/g;s/[Ḍ]/D/g;s/[ḍ]/d/g' a.txt